I have a 69'Camaro with a bone stock 350,crank,rods,pistons,heads,intake and carb. except for a mild cam(under .500 lift) and I put on a NOS cheater system with a 100hp shot and it just loves it. I've used a couple bottles already and the plugs look just fine.
Once you start push'in that button it gets real addictive real fast
Go have fun,man 8)